It is possible (and cheaper) to assemble your own version if you purchase the components separately — or you could customize your version by replacing some/all of the DB9M connector #19 Tibbits with screw-terminal interface #20 Tibbits, for example.

Socket S27 does not provide control line A, so having Tibbit #09 there means you will have no control of the shutdown line, thus the power supply always will be enabled.

WiFi Option

To add WiFi to the system, select the four optional products shown below. One is the WiFi module itself; one is the external antenna interface that connects to it; one is a WiFi antenna; the fourth is a Tibbit Remover that will help you to replace the blank Tibbit in socket S29 with the Tibbit #37 RF connector. You will need a screwdriver to remove the top of the box and the vibration protection plate in order to install the WiFi components (then you can put everything back together).